Remote mouse for a Hikvision hybrid DVR

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I have a Hikvision hybrid DVR and wish to position it in one building but I want to operate it from another building. I can remotely access the screen (either by extending the VGA output or using Hik-Connect) but need to extend the mouse - any suggestions ? I have Cat5 between the buildings, however the distance is about 100metres and I note that any USB extender products covering more than about 100ft are very expensive.